In this video I break down my TOP 5 spark plug picks for Harley-Davidson in 2026, with the goal of making the choice simple for DIY riders who just want their bike to start easier, run cleaner, and stop acting up under load. I’m looking at what actually matters on a V-Twin: consistent ignition, clean combustion, and plugs that hold up so you’re not chasing misfires, rough idle, or that annoying stumble when you crack the throttle. I also talk through what to look for when you’re deciding between OEM-style replacements and aftermarket upgrades—things like reliability for daily riding, cold-start behavior, and how the right plug can help reduce misfires and knock when everything else in the tune-up is in good shape. Whether you’re on a Sportster, Softail, Touring, Dyna, Road King, Street Glide, or Electra Glide, the takeaway is the same: match the plug to your setup (stock vs performance), don’t overthink the hype, and buy from a source you trust. I’ve got the current links and pricing on my site so you can grab the right set without digging around.